181106-N-ME396-043 GROTON, Conn. (Nov. 6, 2018) Senior Chief Machinist's Mate (Auxiliary) Pete Houghton, an instructor at Naval Submarine School (SUBSCOL), programs a training scenario into SUBSCOL's Multipurpose Reconfigurable Training System 3D (MRTS 3D). MRTS 3D is an advanced virtual reality simulation of the diesel auxiliary system aboard a modern American submarine designed to give Sailors a hands-on training experience handling equipment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Tristan B. Lotz/Released)